Introduction of Developed Reservoir Quality Index: Study of Kangan Formation in an Iranian Hydrocarbon Field

The purpose of this study is determination of reservoir quality in different zones of Kangan reservoir formation in a well located at one of hydrocarbon fields in south of Iran. This study was performed to evaluate the reservoir petrophysical characteristics of Kangan formation using probabilistic method. In this study, the effective parameters on the reservoir quality comprising of porosity, permeability and water saturation were selected. Then, the effect of each of these parameters was investigated on the reservoir quality, and as a result, a new index or formula, called developed reservoir quality index, was introduced. Based on the importance of each of these parameters in the introduced reservoir quality, different values were selected for the coefficients A, B, C, and powers α, β and γ in the formula, and consequently, the best values of these coefficients and powers were obtained by plotting the developed reservoir quality index in terms of water saturation, and maximizing the amount of regression or determination coefficient. In order to determine the validity of the formula introduced as the developed reservoir quality index for other reservoir formations, this formula were used for the Sarvak carbonate formation in an oil field. DRQI and RQI were plotted for units of Kangan reservoir formation versus depth and compared. The calculated results of DRQI indicate that the zone K2 of the Kangan Formation has an appropriate reservoir quality in terms of the developed reservoir quality index. The results of the petrophysical evaluation of the Kangan formation are also shown the same result.